Mer/Documentation/ARM CPU: Difference between revisions

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*Display
== Arm variations ==
**Display brightness
The ARM processor has [http://en.wikipedia.org/wiki/ARM_architecture several variations].
**Ambient light sensor
**Touch events


*Buttons/Switches
When Ubuntu supported ARM they built armv5el
**Headphone detect
**Headset switch events (via dbus)
**Keyboard
**Battery cover/SD door events
**HW Buttons (zoom,lock etc)
**Power  Button
**Camera eject


*Devices
When Debian supported ARM they built armv4t ( eabi armv4 + thumb)
**Camera
 
**Sound Microphone
(cf building for i386 or i486 ... i486 code won't run on old 386 CPUs)
**Sound Speakers/Mic
 
**Bluetooth
The armv5el code makes better use of newer hardware and runs faster on it so the main Mer support is for Ubuntu.
**Wifi
We have a Debian port to support the slightly older devices (and to keep options open)
**GPS
 
**Battery
The Nokia internet tablets are armv6
**Power control
The Freerunner is armv4
**MMC reader
 
**USB
Future Ubuntu releases (Karmic) will be v6+ and maybe, eventually higher.
**TV-OUT
 
[[Category:Documentation]]

Latest revision as of 12:06, 22 September 2010

Mer is back : Please visit http://www.merproject.org to learn more about this news.


Arm variations

The ARM processor has several variations.

When Ubuntu supported ARM they built armv5el

When Debian supported ARM they built armv4t ( eabi armv4 + thumb)

(cf building for i386 or i486 ... i486 code won't run on old 386 CPUs)

The armv5el code makes better use of newer hardware and runs faster on it so the main Mer support is for Ubuntu. We have a Debian port to support the slightly older devices (and to keep options open)

The Nokia internet tablets are armv6 The Freerunner is armv4

Future Ubuntu releases (Karmic) will be v6+ and maybe, eventually higher.